Correct Sling Rings SHOULD...

Safety Notes

Mesh slings are NOT designed for general hot-weather use. The fabric tends to slip when dry, and can be extremely diggy and uncomfortable. A cotton or linen sling or wrap will offer much more breathability in the heat.

On the other hand, cotton/linen/wool/etc wraps and slings should NOT be used in the water. Natural fibers will absorb water and swell, causing the fabric to become exponentially heaver, saggier, and dig into your shoulders. (Think about how much heavier a WET towel is compared to a DRY towel.) This puts much more strain on the fabric and may weaken it. Rayon/bamboo/tencel is particularly brittle when wet. In addition, if you are wearing in a pool, the chlorine can damage the fibers.

Back carrying should NEVER be done in a water setting. You should have a clear view of baby's airway at all times when water is involved! Be aware of what "dry drowning" is - submersion is not the only risk when it comes to children and water.

Tutorials and Related Notes

If you want to make a wrap instead of a ring sling, you can use the measurements in the Woven Wrap Tutorial to cut your fabric to width/length. You can use any size wrap you like if you have the appropriate mesh with the appropriate stretch. Keep in mind that athletic mesh does not have to be hemmed if you don't want to, so cutting to width/length is the only step needed.

If you cannot find a safe mesh, you can instead use swimsuit material (100% spandex/lycra) to make a stretchy wrap. Keep in mind that this will be a little less supportive of bigger babies and must be worn with three passes over baby's back at all times.